单项选择题

My brother ______ while he ______ his bicycle and hurt himself.

A．fell... was riding
B．fell... were riding
C．had fallen... rode
D．had fallen... was riding
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单项选择题
I ______ ten minutes to decide whether I should reject the offer.
A．gave
B．was given
C．was giving
D．had given
单项选择题
We write to each other ______ , even when there's not much to say.
A．now and then
B．by and by
C．step by step
D．more or less
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